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https://issues.apache.org/jira/browse/CASSANDRA-17992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17748213#comment-17748213
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Jacek Lewandowski commented on CASSANDRA-17992:
-----------------------------------------------

UPDATE: After rebasing (SAI), the tests hangs instead of failing! All in all, I 
suspect this has something to do with {{FastThreadLocal}} being loaded by a 
different class loader than we expect at some comparison point. I suppose that 
it can be something in either simulation or distributed tests framework, don't 
really know yet as my knowledge about that stuff is very limited. 

> Upgrade Netty on 5.0
> --------------------
>
>                 Key: CASSANDRA-17992
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17992
>             Project: Cassandra
>          Issue Type: Task
>          Components: Dependencies
>            Reporter: Ekaterina Dimitrova
>            Assignee: Jacek Lewandowski
>            Priority: Low
>             Fix For: 5.x
>
>         Attachments: important-netty-inter-releases.md, 
> netty-release-notes-filtered.md, netty-release-notes.md
>
>
> I haven't been able to identify from the Netty docs which was the lowest 
> version where JDK17 was added but we are about 40 versions behind in netty 4 
> so I suspect we better update. 
> -We need to consider there was an issue with class cast exceptions when 
> building with JDK17 with newer versions of netty (the newest available in 
> March 2022). For the record, we didn't see those when running CI on JDK8 and 
> JDK11. We also need to carefully revise the changes between the netty 
> versions. -->- CASSANDRA-18180
> Upgrading will cover also a fix in netty that was discussed in 
> [this|https://the-asf.slack.com/archives/CK23JSY2K/p1665567660202989] ASF 
> Slack thread. 
> CC [~benedict] , [~aleksey] 



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